[Inkscape-user] Gradient -> PDF?

Hello, If I save a PDF of a gradient filled circle, the gradient looks perfect in Linux Acrobat Reader (7.x IIRC) but in a more recent version of Acrobat Reader (8.1.0) on OS X and Apple's Preview.app, the gradient is a solid color.

Does this occur in Windows versions of Acrobat Reader as well? Is there any solution to this other than resorting to a different filetype (e.g. bitmap)?

Thanks, -TAG Todd A. Gibson